This kind of food _____ cool, clean and ...

This kind of food _____ cool, clean and dry according to the instruction.

A．should be carried

B．must be put

C．should be placed

D．must be kept

D 【解析】本题主要考查被动语态，根据题意可知，主语book是动作的承受者，故用被动语态，keep是保存的意思，must表示“一定”，因此选D

考点分析：

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